A cobpobation



E. W. HENGER.

TERMINAL POST FOR BAT APPLICATION man MA TERY CARBONS.

Patented J ulyfi, 1920.

UNITED STATES PATENT OFFICE.

EDWIN W. HENGER, OF WATERBURY, CONNECTICUT, ASSIGNOR TO THE CHASE COMPANIES, 1110., OF WATERBURY, CONNECTICUT, A CORPORATION.

TERMINAL POST FOR BATTERY-CARBONS.

Specification of Letters Patent.

' Patented July 6,1920.

Application filed March 13, 1920. Serial No. 365,496.

To all whom it may concern:

Be it known that I, EDWIN W. HENGER, a citizen of the United States, residing at Waterbury, in the county of New Haven and State of Connecticut, have invented a new and useful Improvement in Terminal Posts for Batter -Carbons; and I do hereby declare the ollowing, when taken in connection with the accompanying drawings and the characters of reference marked thereon, to be a full, clear, and'exact description of the same, and which said drawings constitute part of this application, and represent, in

Figure 1, a broken view in side elevation of a battery-carbon or electrode having its upper end broken away to show the mounting therein of one of my improved terminal-posts.

Fig. 2, a corresponding View showing the battery post in vertical section.

Fig. 3, a broken sectional view of the electrode prior to the insertion of the terminalost.

p Fig. 4c, a detached view in elevation of the p My invention relates to an improved terminal-post for battery-carbons or electrodes, the object being to produce at a low cost of manufacture, a post which may be readily installed in a carbon-electrode, with a permanency not before secured.

With these ends in view, my invention consists in a terminalpost having a spirally fluted anchoring-stem, a binding-screw, and an annular bearing-flange interposed between the same.

In carrying out my invention, I produce a one-piece terminal-post comprising arelatively long spirally fluted anchoring-stem 2, a binding-screw 3, and an annular bearingflange 4: interposed between the same, the anchoring-stem being formed with spirally arranged flutes or knurls of extremely coarse lead or pitch standing at acute angles to the longitudinal axis of the post, whereby it may be inserted into a concentric hole 5 of a diameter represented by the roots of the flutes and formed in the upper end of the carbon-electrode 6.

For introducing the anchoring-stem into the carbon-electrode, the post is mounted in a chuck-like fixture to which is imparted a spiral movement corresponding to the pitch of the knurls, each of which acts as a cutting-edge to cut its way into the side walls of the hole 5, whereby the anchoring-stem is so embedded in the composition of the electrode to the depth of the roots of the knurls, that it is practically impossible to withdraw it by either longitudinal or rotary movement. It will be readily understood that the reversal of a binding-nut upon the binding-screw 3 can have no effect whatever upon the anchorage so obtained of the stem 2, since the pitch of the thread of the screw is so fine as compared with the rank pitch of the flutes of the knurled stem that the post can only be unscrewed from the carbon by a combined lifting and rotary movement so unusual and requiring so much power that practically under no conditions of use could it ever be applied for the removal of the post. As shown, the bore 5 is made slightly longer than the length of the stem 2 to accommodate any carbon dislodged from the side Walls of the hole or bore, in turning the stem thereinto. I am aware that a terminal-post battery-carbon having a thread of uniformly fine pitch from end to end, is old. I am also aware that such a carbon having a binding-screw, an anchoring-stem, and an interposed bearing-flange,

is old When the anchoring-stem is formed with longitudinal ribs to hold it against rotation.

I claim:

A terminal-post for battery carbons or electrodes, the said post comprising a binding-screw, an anchoring-stem, and an annular bearing-flange between the same, the anchoring-stem being spirally fluted with flutes of relatively coarse pitch as compared with the threads of the binding-screw, whereby the stem holds the post against rotation in the electrode, and prevents its, being withdrawn therefrom by pulls in the direction of its length.

In testimony whereof, I have signed this specification in the presence of two subscribing witnesses.

JOHN S. NEAeLE, A. C. REoKnR. 

